1 unit = 1m
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Manual adjustments Ctrl , preferences

Install Hardops first, then Boxcutter. This way Boxcutter is the first mode you access when pressing Alt w

A curated list of Blender Add-on's

Assign shaders to selected meshes with the same name as the shader

import bpy
# Get selected objects
selected_objects = bpy.context.selected_objects
# Loop through selected objects
for obj in selected_objects:
    if obj.type == 'MESH':
        # Check if there's a material with the same name as the object
        matching_material = bpy.data.materials.get(obj.name)
      
        if matching_material:
            # Clear existing materials on the object
            obj.data.materials.clear()
          
            # Assign the matching material to the object
            obj.data.materials.append(matching_material)
            print(f"Assigned material '{matching_material.name}' to object '{obj.name}'")
        else:
            print(f"No matching material found for object '{obj.name}'")
print("Material assignment complete for selected objects.")

Quickly Import KitBash3D Models into the Blender Asset Browser

# Open your KB3D Pack. Make sure the textures are loaded and everything works as intended. This script assumes the Scene is named KB3D_"TitleCasePackName"-Native. It should be that by default.
# Create a new folder in your Asset Library Folder for Blender. (Edit>Preferences>FilePaths>AssetLibraries). I recommend a setup like this 
# (D:/BlenderAssetLibraries/KB3D/CyberDistricts/Cyberdistricts.blend)
# Where "CyberDistricts" would be the AssetLibrary.
# Open the script in Blender by going to the Text Editor and clicking "Open" to locate the file, or paste it from the Gist.
# Run the script by clicking the "Run Script" button in the Text Editor or pressing Alt+P.
# The script will create new collections for each type of asset in your scene and move the assets into these collections. It will also generate a unique ID for the asset pack and each asset in the pack.
# The script will then update the asset catalog file to include the new asset pack and each asset in the pack.
# Once the script is finished, you can save your Blender file and close it.
# You should now see it in the asset libraries section on Blender.
# Troubleshooting: If something goes wrong or a mistake is maid I have minimal errorchecking. Just undo before the script was run and delete the Catalogs or the "blender_assets.cats.txt" file, 
# they may trip up the script if it failed partway through.
# I put a lot of effort into making this, so if you'd like to show your appreciation-
#   you can donate to me through PayPal at the link below: https://paypal.me/mintyfresh

# Update: Remade better.
# TODO: Add simple GUI, test all packs, ensure consistent sizing and proper integration for easy placing of props.

import bpy
import os
from pathlib import Path
import uuid

#filename
file_name = str(bpy.data.scenes.keys()[0].split('_')[1].split('-')[0])
folder = Path(bpy.data.filepath).parent
new_uuid = str(uuid.uuid4())

# Mapping for collections to asset types
collection_map = {
    "Props": "Prop",
    "Buildings": "Bldg",
    "Structures": "Strc",
    "Vehicles": "Vehi",
    "Creatures": "Crea"
}
kit_catalog = {}

flipped_cmap = {v: k for k, v in collection_map.items()}

# Create the primary collections
primary_collections = ["Props", "Buildings", "Structures", "Vehicles", "Creatures", "Other"]
for collection_name in primary_collections:
    new_collection = bpy.data.collections.new(collection_name)
    bpy.context.scene.collection.children.link(new_collection)

# Loop through all the empties and sort them into the collections for the library
for obj in bpy.data.objects:
    if obj.type == "EMPTY" and obj.name.startswith("KB3D_"):

        # Sort the new collection into the correct group
        asset_type = obj.name.split("_")[2][:4]

        # Check if the asset_type exists in the flipped_cmap dictionary
        if asset_type in flipped_cmap:
            cm_col_name = flipped_cmap[asset_type]
        else:
            cm_col_name = "Other"

        # Create a new collection with Empty's name
        new_collection = bpy.data.collections.new(obj.name)
        bpy.data.collections[obj.name].objects.link(obj)

        # Linking Object groups
        cm_col = bpy.data.collections[cm_col_name]
        # Move the object's children to the new collection
        bpy.data.collections[cm_col.name].children.link(bpy.data.collections[obj.name])
        kit_catalog[obj.name] = cm_col.name
        
print(kit_catalog.values())

# Loop over Object and relink to parents.
for obj in bpy.data.objects:
    if obj.type == "MESH" and obj.parent != None:
        bpy.data.collections[obj.parent.name].objects.link(obj)
        
for empty in bpy.data.objects:
    if empty.type == 'EMPTY' and empty.name.startswith('KB3D_'):
        bpy.context.scene.collection.objects.unlink(empty)
        for child in empty.children:
            bpy.context.scene.collection.objects.unlink(child)

for col in bpy.data.collections:
    if col.name.startswith('KB3D_'):
        col.asset_mark()

# Create a list of all empty objects
empty_objects = [obj for obj in bpy.data.objects if obj.type == "EMPTY" and obj.name.startswith("KB3D_")]

# Loop through the list of empty objects and clear their locations
for obj in empty_objects:
    obj.location = (0, 0, 0)

asset_catalog_path = folder / "blender_assets.cats.txt"

# Initialize the list of lines and the asset_uuids dictionary
lines = []
asset_uuids = {}

# Read the existing asset catalog file into a list of lines
with asset_catalog_path.open('a+') as f:
    f.seek(0)  # Move the file pointer to the beginning of the file
    lines = f.readlines()

# Check if the blender_assets.cats.txt file is empty and initialize it if necessary
if os.path.getsize(asset_catalog_path) == 0:
    header_lines = [
        "# This is an Asset Catalog Definition file for Blender.\n",
        "#\n",
        "# Empty lines and lines starting with `#` will be ignored.\n",
        "# The first non-ignored line should be the version indicator.\n",
        "# Other lines are of the format \"UUID:catalog/path/for/assets:simple catalog name\"\n",
        "\n",
        "VERSION 1\n\n"
    ]
    lines.extend(header_lines)

# Add new lines to the catalog if necessary
file_contents = ''.join(lines)

# Initialize the asset_uuids dictionary outside the condition
collection_uuids = {collection_name: [] for collection_name in collection_map.keys()}
collection_uuids["Other"] = []

if file_name not in file_contents:
    if "KB3D" not in file_contents:
        lines.append(f"{str(uuid.uuid4())}:KB3D:KB3D\n")
    lines.append(f"{str(uuid.uuid4())}:KB3D/{file_name}:{file_name}\n")

    for collection_name in collection_map.keys():
        asset_uuid = str(uuid.uuid4())
        asset_uuids[collection_name] = asset_uuid
        lines.append(f"{asset_uuid}:KB3D/{file_name}/{collection_name}:{collection_name}\n")

    asset_uuid = str(uuid.uuid4())
    asset_uuids["Other"] = asset_uuid
    lines.append(f"{asset_uuid}:KB3D/{file_name}/Other:Other\n")

# Write the updated list of lines back to the file
with asset_catalog_path.open("w") as f:
    f.writelines(lines)

kit_catalog = {}

# Asset Library Adder
for col in bpy.data.collections:
    if col.name.startswith("KB3D_"):
        # Gets the asset type of an object from the Name
        # Ex: Bldg Prop Strc
        asset_type = col.name.split("_")[2][:4]  # e.g. "Bldg"

        # Check if the asset_type exists in the flipped_cmap dictionary
        if asset_type in flipped_cmap:
            asset_name = flipped_cmap[asset_type]  # e.g. "Buildings"
            col.asset_data.catalog_id = asset_uuids[asset_name]
        else:
            asset_name = "Other"
            col.asset_data.catalog_id = asset_uuids[asset_name]  # Set the catalog_id for the "Other" category

        print(col.name, asset_name)
        # Linking Object groups
        cm_col = bpy.data.collections[col.name]  # Buildings [Collection]
        print('adding', col.name, 'asset_data')

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